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Preparation method of potassium hydroxide modified magnetic corncob biochar composite material applied to removal of imidacloprid in water

A potassium hydroxide and composite material technology, applied in the directions of alkali metal oxides/hydroxides, chemical instruments and methods, water pollutants, etc., can solve problems such as large-scale application limitations, poor adsorption performance, etc., and achieve resource utilization Utilize, realize the effect of recycling and regeneration, reduce ecological risk

Pending Publication Date: 2020-11-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that corn cob biochar has a certain adsorption capacity for organic pollutants (methylene blue and aureomycin, etc.), but its relatively poor adsorption performance limits its large-scale application to a certain extent.

Method used

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  • Preparation method of potassium hydroxide modified magnetic corncob biochar composite material applied to removal of imidacloprid in water
  • Preparation method of potassium hydroxide modified magnetic corncob biochar composite material applied to removal of imidacloprid in water
  • Preparation method of potassium hydroxide modified magnetic corncob biochar composite material applied to removal of imidacloprid in water

Examples

Experimental program
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Effect test

example 1

[0048] Example 1: Put the corncobs in a blast oven at 70°C and dry them to constant weight, then transfer them to a high-temperature tube furnace (N 2 The flow rate is 1.0L / min, the heating rate is 10°C / min), pyrolyzed at 400°C for 120min, and ground through a 100-mesh sieve to obtain corncob biochar CBC. Mix CBC (5.0g in mass) and KOH (5.0g in mass) and transfer them into a high-temperature tube furnace (the pyrolysis conditions are the same as the preparation process of CBC), grind them through a 100-mesh sieve, and obtain potassium hydroxide modified Corn cob biochar KOH-CBC. Add 150mL of CBC with a mass of 5.0g to dissolve FeCl 3 ·6H 2 O (mass 2g) and ZnCl 2 (2g) in the solution, at 25 DEG C and rotating speed be the constant temperature shaking box of 150rmp / min shaking 1440min, be placed in 70 DEG C of blast ovens and dry to constant weight, then change over to pyrolysis in the high-temperature tube furnace ( The pyrolysis conditions are the same as the preparation p...

example 2

[0049] Example 2: 0.03-0.09g / L of KOH+Fe / Zn-CBC was added into the imidacloprid solution with a volume of 100mL and a concentration of 20mg / L, and the adsorption experiment was carried out in a constant temperature shaking box (150rmp / min) at 25°C. Sampling at the set time (5-720min), measure the absorbance of imidacloprid at λ=270nm with a UV photometer, and calculate the removal rate of imidacloprid at different times.

[0050] It can be seen from Figure 1(a) that KOH+Fe / Zn-CBC can achieve efficient removal of imidacloprid at the initial stage of the experiment, and the removal rate of imidacloprid increases with the increase of adsorbent dosage and reaction time. When the dosage is 0.09g / L, the removal rate of imidacloprid can reach 96.54% in 720min.

example 3

[0051] Example 3: Adding CBC, KOH-CBC, Fe / Zn-CBC and KOH+Fe / Zn-CBC with a dose of 0.07g / L to an imidacloprid solution with a volume of 100mL and a concentration of 20mg / L and pH=2-11 (Use 0.1 mol / L HCl and NaOH to adjust the pH of the solution), put it in a constant temperature shaking box (150rmp / min) at 25°C for adsorption experiments, and when the adsorption is balanced, use a UV photometer to measure imidacloprid at λ=270nm The absorbance of the four biochars was calculated to calculate the adsorption capacity of the four biochars.

[0052] It can be seen from Figure 1(b) that the adsorption capacity of imidacloprid by the adsorbents CBC, KOH-CBC, Fe / Zn-CBC and KOH+Fe / Zn-CBC is not greatly affected by the pH of the solution, but the four biochars are all at pH =5-6, the adsorption capacity of imidacloprid is the strongest, and the maximum adsorption capacity of KOH+Fe / Zn-CBC to imidacloprid can reach 220.3mg / g when pH=5.

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Abstract

The invention discloses a preparation method of a potassium hydroxide modified magnetic corncob biochar composite material for removing imidacloprid in water, which comprises the following steps: carrying out mixing pyrolysis (KOH-CBC) on corncob biochar (CBC) and potassium hydroxide (KOH), loading ferric chloride (FeCl3.6H2O) and zinc chloride (ZnCl2) to the KOHCBC, and carrying out secondary pyrolysis to obtain potassium hydroxide modified magnetic corncob biochar KOH + Fe / ZnCBC. The material prepared by the invention has good physicochemical properties, has a high removal rate on imidacloprid in water, and has a maximum adsorption capacity of 433.1 mg / g at 35 DEG C. In addition, the material shows high magnetic separation capacity, and efficient separation and regeneration with a waterbody can be achieved after adsorption.

Description

technical field [0001] The invention relates to the technical fields of biochar preparation and water treatment, in particular to a method for preparing a potassium hydroxide-modified magnetic corncob biochar composite material applied to imidacloprid removal in water. Background technique [0002] Neonicotinoid pesticides are nicotinyl chloride insecticides. Neonicotinoid has a unique mode of action, good root systemicity, low mammalian toxicity, high efficiency, broad spectrum and good environmental compatibility, and has a very good control effect on Homoptera and aphids in agricultural production . Imidacloprid, a first-generation neonicotinoid insecticide, has rapidly become one of the fastest-growing and most effective insecticides on the market since it was commercialized in 1990. Imidacloprid can selectively act on the nicotinic acetylcholine receptors (nAChRs) in the central nervous system (CNS) of insects, and paralyze or even kill the pests by interfering with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28C02F1/28B01J20/30C02F101/30
CPCB01J20/20B01J20/041B01J20/28009C02F1/281C02F1/283C02F2101/30
Inventor 张祖麟卢停妹陈思宇戚勇杨列马永飞
Owner WUHAN UNIV OF TECH
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